java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at processing.core.PApplet.join(PApplet.java:8950)
at de.fhpotsdam.unfolding.data.GeoJSONReader.loadData(Unknown Source)
at undefined.Map.setup(Map.java:45)
at processing.core.PApplet.handleDraw(PApplet.java:2361)
at processing.core.PGraphicsJava2D.requestDraw(PGraphicsJava2D.java:240)
at processing.core.PApplet.run(PApplet.java:2256)
at java.lang.Thread.run(Unknown Source)

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